added methods getInstructors() and getStudentIds()
added methods getInstructors() and getStudentIds()

rafati/unitime,rafati/unitime,nikeshmhr/unitime,maciej-zygmunt/unitime,sktoo/timetabling-system-,sktoo/timetabling-system-,nikeshmhr/unitime,zuzanamullerova/unitime,UniTime/unitime,zuzanamullerova/unitime,sktoo/timetabling-system-,maciej-zygmunt/unitime,rafati/unitime,zuzanamullerova/unitime,nikeshmhr/unitime,UniTime/unitime,UniTime/unitime,maciej-zygmunt/unitime